if you have the patience to argue with me I would value your reply..
for me, a security barrier is cryptographic
software and software-controlled-hardware barriers are just inconveniences
so the hypervisor you mention happens not to make it easy to see into a vm, but with the right combination of software failures or subversion it is possible
the openssl and CPU vulnerabilities (heartbleed, spectre) are illustrative examples
am i being too pendantic about a security boundary?